Relationship between soil salinity and Bassia hirsuta, Salicornia europaea agg. and Petrosimonia brachyata distribution on the territory of Pomorie lake and Atanasovsko lake

M. Todorova1*, N. Grozeva2, L. Pleskuza1, Z. Yaneva3, M. Gerdgikova1

1Department of Plant Production, Faculty of Agriculture, Trakia University, 6000 Stara Zagora, Bulgaria
2Department of Biology and Aquaculture, Faculty of Agriculture, Trakia University, 6000 Stara Zagora, Bulgaria
3Department of Pharmacology, Animal Physiology and Physiological Chemistry, Faculty of Veterinary Medicine, Trakia University, 6000 Stara Zagora, Bulgaria

Abstract. In the Black Sea biogeographical region on the territory of Bulgaria there are only two Salinas – Atanasovsko lake and Pomorie lake. Since 1980 the north part of Atanasovsko lake has been declared nature reserve. Since 1999 the northern a part of the lake has been re-categorized as Managed Nature Reserve according to the new Protected Areas Act. Since 2001 Pomorie lake has been declared Protected Site. The aim of the study was to assess the relationship between soil salinity and halophyte plants distribution – Salicornia europaea agg., Bassia hirsuta (L.) Asch. and Petrosimonia brachiata (Pall.) Bunge on the territory of both protected areas.The period of investigation was between September and October,2013.A total of 22 soil samples were taken from a depth of 0 – 20 cm. In each sample taking point vascular plants of Salicornia europaea aggr., Bassia hirsuta and Petrosimonia brachiata existing there, were also collected. The collected soil samples were analyzed for electrical conductivity (EC), pH, Cl-, CO – and HCO – content. The soil from the studied 33 territory of Atanasovsko lake Manage Nature Reserve was characterized with alkaline to strong alkaline reaction and high level of salinity. The alluvial deposit from Pomoriе lake Protected Site was characterized with neutral to alkaline reaction and light to high salinity. Salicornia europaea forms populations on alkalinesoil, with salinity from 2to44mS/cm,but dominates on high salinity soil,above14mS/cm. Bassia hirsuta forms populations on soil with neutralto moderate alkaline reaction and from light to high salinity, with ЕС up to14 mS/cm. Petrosimonia brachyata forms populations on alkaline soil, from light to moderatesalinity,withvaluesof ЕСfrom2to6mS/cm.

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